From: Ian Lance Taylor <ian@zembu.com>
To: geoffk@cygnus.com
Cc: ulfc@calypso.engr.sgi.com, ac131313@cygnus.com,
alan@linuxcare.com.au, binutils@sourceware.cygnus.com,
gdb-patches@sourceware.cygnus.com
Subject: Re: [rfc] For mips, sign-extended ecoff offsets
Date: Mon, 19 Jun 2000 20:41:00 -0000 [thread overview]
Message-ID: <20000620034102.18244.qmail@daffy.airs.com> (raw)
In-Reply-To: <200006200307.UAA10516@localhost.cygnus.com>
Date: Mon, 19 Jun 2000 20:07:59 -0700
From: Geoff Keating <geoffk@cygnus.com>
> From: Ulf Carlsson <ulfc@calypso.engr.sgi.com>
> Date: Mon, 19 Jun 2000 18:45:44 -0700 (PDT)
> On a 64-bit MIPS processor 32-bit addresses are of course sign
> extended, but this shouldn't concern the 32-bit BFD backend for MIPS
> in any way. Whether we sign extend the addresses or not shouldn't
> make any difference except in our internal representation of the
> bfd_vma. I may be wrong though!
The 64-bit MIPS machines often use the 32-bit ELF format, typically
because they have 32-bit memory addresses (I forget whether trying to
access 0x0000000087654321 gives you 0xffffffff87654321 or a trap).
I think the real reason this happens is historical--because we didn't
have a 64-bit MIPS format when we started supporting 64-bit MIPS
chips. I don't think there is any particularly legitimate reason to
use a 32-bit format for a 64-bit chip.
Ian
next prev parent reply other threads:[~2000-06-19 20:41 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-06-19 5:14 Andrew Cagney
2000-06-19 8:48 ` Alan Modra
2000-06-19 18:18 ` Andrew Cagney
2000-06-19 18:47 ` Ulf Carlsson
2000-06-19 18:57 ` Alan Modra
2000-06-19 19:16 ` Andrew Cagney
2000-06-19 20:08 ` Geoff Keating
2000-06-19 20:41 ` Ian Lance Taylor [this message]
2000-06-25 14:13 ` Ralf Baechle
[not found] ` <14670.59816.517716.492387@calypso.engr.sgi.com>
2000-06-19 21:30 ` Geoff Keating
2000-06-19 18:50 ` Alan Modra
2000-06-19 19:23 ` Andrew Cagney
2000-06-19 20:39 ` Ian Lance Taylor
2000-06-23 0:28 ` Andrew Cagney
2000-06-23 9:48 ` Ian Lance Taylor
2000-07-03 23:47 ` Andrew Cagney
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